Embedded/perf_counter
1
0
Fork 0
mirror of https://github.com/GorgonMeducer/perf_counter.git synced 2025-01-17 19:13:03 +08:00
Code Issues Packages Projects Releases Wiki Activity

Update perf_counter.c

Browse Source
This commit is contained in:
Gabriel Wang 2024-12-06 11:45:14 +00:00 committed by GitHub
parent aec5ec1cef
commit 8895f2ba5e
No known key found for this signature in database
GPG Key ID: B5690EEEBB952194
1 changed files with 7 additions and 18 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

25
perf_counter.c
View File

@ -181,33 +181,22 @@ bool init_cycle_counter(bool bIsSysTickOccupied)
*/
__STATIC_INLINE int64_t check_systick(void)
{
int64_t lLoad = perfc_port_get_system_timer_top() + 1;
int64_t lTemp = perfc_port_get_system_timer_elapsed();
/* Since we cannot stop counting temporarily, there are several
* conditions which we should take into consideration:
* - Condition 1: when assigning nTemp with the register value (LOAD-VAL),
* the underflow didn't happen but when we check the PENDSTSET bit,
* the underflow happens, for this condition, we should not
* do any compensation. When this happens, the (LOAD-nTemp) is
* smaller than PERF_CNT_COMPENSATION_THRESHOLD (a small value) as
* long as LOAD is bigger than (or equals to) the
* PERF_CNT_COMPENSATION_THRESHOLD;
* - Condition 2: when assigning nTemp with the register value (LOAD-VAL),
* the VAL is zero and underflow happened and the PENDSTSET bit
* is set, for this condition, we should not do any compensation.
* When this happens, the (LOAD-nTemp) is equals to zero.
* - Condition 3: when assigning nTemp with the register value (LOAD-VAL),
* the underflow has already happened, hence the PENDSTSET
* is set, for this condition, we should compensate the return
* value. When this happens, the (LOAD-nTemp) is bigger than (or
* equals to) PERF_CNT_COMPENSATION_THRESHOLD.
* the underflow happens, for this condition, we should recall the
* perfc_port_get_system_timer_elapsed().
* The following code implements an equivalent logic.
*/
if (perfc_port_is_system_timer_ovf_pending()){
//if ((lLoad - lTemp) >= PERF_CNT_COMPENSATION_THRESHOLD) {
lTemp += lLoad;
//}
/* refresh the elapsed just in case the counter has just overflowed/underflowed
* after we called the perfc_port_get_system_timer_elapsed()
*/
lTemp = perfc_port_get_system_timer_elapsed();
lTemp += perfc_port_get_system_timer_top() + 1;
}
return lTemp;